21331232101 has 4 divisors (see below), whose sum is σ = 21398523372. Its totient is φ = 21263940832.

The previous prime is 21331232077. The next prime is 21331232129. The reversal of 21331232101 is 10123213312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9945275076 + 11385957025 = 99726^2 + 106705^2 .

It is a cyclic number.

It is not a de Polignac number, because 21331232101 - 2²⁷ = 21197014373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331232701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33645160 + ... + 33645793.

It is an arithmetic number, because the mean of its divisors is an integer number (5349630843).

Almost surely, 2^21331232101 is an apocalyptic number.

It is an amenable number.

21331232101 is a deficient number, since it is larger than the sum of its proper divisors (67291271).

21331232101 is an equidigital number, since it uses as much as digits as its factorization.

21331232101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67291270.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21331232101 its reverse (10123213312), we get a palindrome (31454445413).

The spelling of 21331232101 in words is "twenty-one billion, three hundred thirty-one million, two hundred thirty-two thousand, one hundred one".